Nvidia's value soars by $400 billion in 5 days. That's more than Costco is worth.

Nvidia's value soars by $400 billion in 5 days. That's more than Costco is worth.

Chip Somodevilla/Getty Images

Fresh buzz around AI lifted Nvidia stock by 4% on Tuesday, extending its rally to 14% over the last five trading days and leaving it just shy of its record high.

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